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xii Contents Lesson 3.7 Assessing a Regression Model / 229 Residual Plots 230 The Standard Deviation of the Residuals s 232 The Coefficient of Determination 2r 233 Your Turn Lesson 3.7 Warm body, fast heart? 236 Lesson 3.7 Exercises 237STATS applied! RESOLVED 241 Chapter 3 Main Points / 242 Chapter 3 Review Exercises / 244 Chapter 3 Practice Test / 246 Chapter 3 Project / 248 See Yourself in Stats / 249 Collecting Data 250 STATS applied! How can we prevent malaria? 251 Lesson 4.1 Introduction to Data Collection / 252 Asking Statistical Questions 252 Populations and Samples 253 Observational Studies and Experiments 254 Your Turn Lesson 4.1 Do you have dinner plans? 255 Lesson 4.1 Exercises 256 Lesson 4.2 Sampling: Good and Bad / 259 How to Sample Poorly: Convenience Samples 260 How to Sample Poorly: Voluntary Response Samples 261 How to Sample Well: Random Samples 262 Your Turn Lesson 4.2 Do you sleep with a dog? 263 Lesson 4.2 Exercises 263 Lesson 4.3 Other Sources of Bias in Surveys / 265 Undercoverage 266 Nonresponse 266 Response Bias 268 Your Turn Lesson 4.3 Who did you say is calling? Literary Digest? 269 Lesson 4.3 Exercises 270 Lesson 4.4 Inference for Sampling / 273 Simple Random Samples 273 Sampling Variability 275 Inference for Sampling 277 Your Turn Lesson 4.4 More lefties? 279 Lesson 4.4 Exercises 280 Lesson 4.5 Observational Studies and Experiments / 283 Confounding 283 Identifying Treatments in an Experiment 285 Control Groups 286 Your Turn Lesson 4.5 What happens when physicians study themselves? 288 Lesson 4.5 Exercises 289 Lesson 4.6 How to Experiment Well / 292 Methods of Random Assignment 293 The Purpose of Random Assignment 294 Controlling Other Sources of Variability 295 Your Turn Lesson 4.6 Multitasking? Or multiple distractions? 296 Lesson 4.6 Exercises 297Chapter 4%u00a9 Bedford, Freeman & Worth Publishers. For review purposes only. Do not distribute.